Displacement vectors of 4 km south, 2 km north, 5 km south, and 5 km north combine to a total displacement of a. 16 km north b. 6 km south c. 16 km south d. 2 km south

I think the answer is 2 km south. This is because when someone moves 4km south and moves 2km north, the final position 2km south. and if the person moves 5 km farther north, the position is now 3km north and if he moves 5km south, the final position is 2km south.